Gearing Vibration 4 Machine design 3 Roller bearings 3 Belt drives 2 Brakes 2 Cams 2 更多 ... Chains 2 Clutches (Machinery) 2 Corrosion and anti-corrosives 2 Couplings 2 Lubrication and lubricants 2 Materials 2 Mechanical movements 2 Mechanical wear 2 Screws 2 Tolerance (Engineering) 2 Air 1 Air conditioning 1 Air quality 1 Belts and belting 1 Boilers 1 Bolted joints 1 Buildings 1 Chain drive 1 Cold working 1 Columns 1 Combustion engineering 1 Commercial buildings 1 Computer networks 1 少 ...